# BRIEFING — 2026-10-03T08:25:00Z

## Mission
Implement Milestone M3: Compile Protobuf bundle for Cocos Creator TypeScript client, extend WebSocket bridge (port 8080) with binary 2-byte opcode dispatch table and zero-residual momentum verification, and verify with unit tests.

## 🔒 My Identity
- Archetype: teamwork_preview_worker
- Roles: implementer, qa, specialist
- Working directory: c:\Projects\FreeExile\.agents\teamwork\worker_proto_server
- Original parent: cecb05d6-3b1b-4c90-84e7-b52ac4e7697c
- Milestone: M3

## 🔒 Key Constraints
- Exclusively own: `server/gateway/ws_gateway_bridge.py`, `scripts/compile_protos.py`, `client/cocos/assets/scripts/proto/`, `tests/unit/test_ws_protobuf_gateway.py`
- DO NOT touch files owned by `worker_cocos_client`
- File length <= 350 lines (soft cap), max 500 lines (hard cap) for logic files
- Integrity Mandate: No hardcoded test results, genuine logic
- Native Impact Guard: Run `python tools/analysis/blast_radius.py --target <path> --ack` if blocked by hook

## Current Parent
- Conversation ID: cecb05d6-3b1b-4c90-84e7-b52ac4e7697c
- Updated: 2026-10-03T08:25:00Z

## Task Summary
- **What to build**: Protobuf bundle compiled to `client/cocos/assets/scripts/proto/` (`bundle.js`, `bundle.d.ts`), WebSocket bridge `server/gateway/ws_gateway_bridge.py` with 2-byte opcode dispatch table and zero-residual momentum verification, roundtrip unit tests in `tests/unit/test_ws_protobuf_gateway.py`.
- **Success criteria**: Cocos proto bundle compiled and typed (17 packages); ws_gateway_bridge handles dual-mode (binary 2-byte opcode + JSON fallback); zero-residual momentum verification on PlayerMoveInput; all 8 unit tests pass; hygiene check passes <= 350 lines.
- **Interface contracts**: `c:\Projects\FreeExile\.agents\teamwork\orchestrator_20\PROJECT.md`
- **Code layout**: `c:\Projects\FreeExile\.agents\teamwork\orchestrator_20\PROJECT.md` § Code Layout

## Key Decisions Made
- Updated `scripts/compile_protos.py` to synchronize compiled `bundle.js` and `bundle.d.ts` into `client/cocos/assets/scripts/proto/`.
- Extended `server/gateway/ws_gateway_bridge.py` with 2-byte big-endian uint16 opcode table matching Milestone M3 specifications.
- Implemented `verify_zero_residual_momentum` in `ws_gateway_bridge.py` providing instant halt with zero trailing velocity on key release (`input_x == 0 && input_y == 0`).
- Maintained legacy JSON compatibility (`ping` -> `pong`, `skill_intent` -> `damage_event`, `auth_simulator` -> `auth_result`).
- Authored 8 comprehensive unit tests in `tests/unit/test_ws_protobuf_gateway.py`.
- Kept `ws_gateway_bridge.py` at 333 lines and `test_ws_protobuf_gateway.py` at 273 lines (strictly <= 350 lines Soft Cap).

## Artifact Index
- `client/cocos/assets/scripts/proto/bundle.js` — Compiled protobufjs ES module
- `client/cocos/assets/scripts/proto/bundle.d.ts` — TypeScript definitions for all 17 proto schemas
- `scripts/compile_protos.py` — Protobuf compiler with Cocos target sync
- `server/gateway/ws_gateway_bridge.py` — Dual-mode binary opcode WebSocket bridge
- `tests/unit/test_ws_protobuf_gateway.py` — 8 unit tests for binary framing and momentum verification

## Change Tracker
- **Files modified**:
  * `scripts/compile_protos.py`: Added `COCOS_PROTO_DIR`, pbts generation, and bundle sync (114 lines).
  * `server/gateway/ws_gateway_bridge.py`: Added 2-byte big-endian opcode framing and zero-residual momentum verification (333 lines).
  * `client/cocos/assets/scripts/proto/bundle.js`: Generated Cocos Protobuf bundle (4.18 MB).
  * `client/cocos/assets/scripts/proto/bundle.d.ts`: Generated Cocos Protobuf typings (1.25 MB).
  * `tests/unit/test_ws_protobuf_gateway.py`: Added unit test suite (273 lines).
- **Build status**: PASS (8/8 unit tests pass, compilation successful)
- **Pending issues**: None

## Quality Status
- **Build/test result**: 8 passed in 0.95s (`pytest tests/unit/test_ws_protobuf_gateway.py`)
- **Lint status**: 0 violations on modified files, hard cap 100% compliant, soft cap <= 350 lines satisfied on all files
- **Tests added/modified**: 8 new unit tests covering encoding, momentum halt, combat, evasion, zone data, portal, chat, and JSON diagnostics

## Loaded Skills
- None